Merge branch 'topic/vmaster-update' into for-linus
[linux-2.6] / drivers / acpi / numa.c
1 /*
2  *  acpi_numa.c - ACPI NUMA support
3  *
4  *  Copyright (C) 2002 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
5  *
6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7  *
8  *  This program is free software; you can redistribute it and/or modify
9  *  it under the terms of the GNU General Public License as published by
10  *  the Free Software Foundation; either version 2 of the License, or
11  *  (at your option) any later version.
12  *
13  *  This program is distributed in the hope that it will be useful,
14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *  GNU General Public License for more details.
17  *
18  *  You should have received a copy of the GNU General Public License
19  *  along with this program; if not, write to the Free Software
20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
21  *
22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23  *
24  */
25 #include <linux/module.h>
26 #include <linux/init.h>
27 #include <linux/kernel.h>
28 #include <linux/types.h>
29 #include <linux/errno.h>
30 #include <linux/acpi.h>
31 #include <acpi/acpi_bus.h>
32
33 #define ACPI_NUMA       0x80000000
34 #define _COMPONENT      ACPI_NUMA
35 ACPI_MODULE_NAME("numa");
36
37 static nodemask_t nodes_found_map = NODE_MASK_NONE;
38
39 /* maps to convert between proximity domain and logical node ID */
40 static int pxm_to_node_map[MAX_PXM_DOMAINS]
41                                 = { [0 ... MAX_PXM_DOMAINS - 1] = NID_INVAL };
42 static int node_to_pxm_map[MAX_NUMNODES]
43                                 = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
44
45 int pxm_to_node(int pxm)
46 {
47         if (pxm < 0)
48                 return NID_INVAL;
49         return pxm_to_node_map[pxm];
50 }
51
52 int node_to_pxm(int node)
53 {
54         if (node < 0)
55                 return PXM_INVAL;
56         return node_to_pxm_map[node];
57 }
58
59 void __acpi_map_pxm_to_node(int pxm, int node)
60 {
61         pxm_to_node_map[pxm] = node;
62         node_to_pxm_map[node] = pxm;
63 }
64
65 int acpi_map_pxm_to_node(int pxm)
66 {
67         int node = pxm_to_node_map[pxm];
68
69         if (node < 0){
70                 if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
71                         return NID_INVAL;
72                 node = first_unset_node(nodes_found_map);
73                 __acpi_map_pxm_to_node(pxm, node);
74                 node_set(node, nodes_found_map);
75         }
76
77         return node;
78 }
79
80 #if 0
81 void __cpuinit acpi_unmap_pxm_to_node(int node)
82 {
83         int pxm = node_to_pxm_map[node];
84         pxm_to_node_map[pxm] = NID_INVAL;
85         node_to_pxm_map[node] = PXM_INVAL;
86         node_clear(node, nodes_found_map);
87 }
88 #endif  /*  0  */
89
90 static void __init
91 acpi_table_print_srat_entry(struct acpi_subtable_header *header)
92 {
93
94         ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");
95
96         if (!header)
97                 return;
98
99         switch (header->type) {
100
101         case ACPI_SRAT_TYPE_CPU_AFFINITY:
102 #ifdef ACPI_DEBUG_OUTPUT
103                 {
104                         struct acpi_srat_cpu_affinity *p =
105                             (struct acpi_srat_cpu_affinity *)header;
106                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
107                                           "SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
108                                           p->apic_id, p->local_sapic_eid,
109                                           p->proximity_domain_lo,
110                                           (p->flags & ACPI_SRAT_CPU_ENABLED)?
111                                           "enabled" : "disabled"));
112                 }
113 #endif                          /* ACPI_DEBUG_OUTPUT */
114                 break;
115
116         case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
117 #ifdef ACPI_DEBUG_OUTPUT
118                 {
119                         struct acpi_srat_mem_affinity *p =
120                             (struct acpi_srat_mem_affinity *)header;
121                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
122                                           "SRAT Memory (0x%lx length 0x%lx) in proximity domain %d %s%s\n",
123                                           (unsigned long)p->base_address,
124                                           (unsigned long)p->length,
125                                           p->proximity_domain,
126                                           (p->flags & ACPI_SRAT_MEM_ENABLED)?
127                                           "enabled" : "disabled",
128                                           (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)?
129                                           " hot-pluggable" : ""));
130                 }
131 #endif                          /* ACPI_DEBUG_OUTPUT */
132                 break;
133
134         default:
135                 printk(KERN_WARNING PREFIX
136                        "Found unsupported SRAT entry (type = 0x%x)\n",
137                        header->type);
138                 break;
139         }
140 }
141
142 /*
143  * A lot of BIOS fill in 10 (= no distance) everywhere. This messes
144  * up the NUMA heuristics which wants the local node to have a smaller
145  * distance than the others.
146  * Do some quick checks here and only use the SLIT if it passes.
147  */
148 static __init int slit_valid(struct acpi_table_slit *slit)
149 {
150         int i, j;
151         int d = slit->locality_count;
152         for (i = 0; i < d; i++) {
153                 for (j = 0; j < d; j++)  {
154                         u8 val = slit->entry[d*i + j];
155                         if (i == j) {
156                                 if (val != LOCAL_DISTANCE)
157                                         return 0;
158                         } else if (val <= LOCAL_DISTANCE)
159                                 return 0;
160                 }
161         }
162         return 1;
163 }
164
165 static int __init acpi_parse_slit(struct acpi_table_header *table)
166 {
167         struct acpi_table_slit *slit;
168
169         if (!table)
170                 return -EINVAL;
171
172         slit = (struct acpi_table_slit *)table;
173
174         if (!slit_valid(slit)) {
175                 printk(KERN_INFO "ACPI: SLIT table looks invalid. Not used.\n");
176                 return -EINVAL;
177         }
178         acpi_numa_slit_init(slit);
179
180         return 0;
181 }
182
183 static int __init
184 acpi_parse_processor_affinity(struct acpi_subtable_header * header,
185                               const unsigned long end)
186 {
187         struct acpi_srat_cpu_affinity *processor_affinity;
188
189         processor_affinity = (struct acpi_srat_cpu_affinity *)header;
190         if (!processor_affinity)
191                 return -EINVAL;
192
193         acpi_table_print_srat_entry(header);
194
195         /* let architecture-dependent part to do it */
196         acpi_numa_processor_affinity_init(processor_affinity);
197
198         return 0;
199 }
200
201 static int __init
202 acpi_parse_memory_affinity(struct acpi_subtable_header * header,
203                            const unsigned long end)
204 {
205         struct acpi_srat_mem_affinity *memory_affinity;
206
207         memory_affinity = (struct acpi_srat_mem_affinity *)header;
208         if (!memory_affinity)
209                 return -EINVAL;
210
211         acpi_table_print_srat_entry(header);
212
213         /* let architecture-dependent part to do it */
214         acpi_numa_memory_affinity_init(memory_affinity);
215
216         return 0;
217 }
218
219 static int __init acpi_parse_srat(struct acpi_table_header *table)
220 {
221         struct acpi_table_srat *srat;
222
223         if (!table)
224                 return -EINVAL;
225
226         srat = (struct acpi_table_srat *)table;
227
228         return 0;
229 }
230
231 static int __init
232 acpi_table_parse_srat(enum acpi_srat_type id,
233                       acpi_table_entry_handler handler, unsigned int max_entries)
234 {
235         return acpi_table_parse_entries(ACPI_SIG_SRAT,
236                                             sizeof(struct acpi_table_srat), id,
237                                             handler, max_entries);
238 }
239
240 int __init acpi_numa_init(void)
241 {
242         /* SRAT: Static Resource Affinity Table */
243         if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
244                 acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
245                                       acpi_parse_processor_affinity, NR_CPUS);
246                 acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
247                                       acpi_parse_memory_affinity,
248                                       NR_NODE_MEMBLKS);
249         }
250
251         /* SLIT: System Locality Information Table */
252         acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
253
254         acpi_numa_arch_fixup();
255         return 0;
256 }
257
258 int acpi_get_pxm(acpi_handle h)
259 {
260         unsigned long long pxm;
261         acpi_status status;
262         acpi_handle handle;
263         acpi_handle phandle = h;
264
265         do {
266                 handle = phandle;
267                 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
268                 if (ACPI_SUCCESS(status))
269                         return pxm;
270                 status = acpi_get_parent(handle, &phandle);
271         } while (ACPI_SUCCESS(status));
272         return -1;
273 }
274
275 int acpi_get_node(acpi_handle *handle)
276 {
277         int pxm, node = -1;
278
279         pxm = acpi_get_pxm(handle);
280         if (pxm >= 0 && pxm < MAX_PXM_DOMAINS)
281                 node = acpi_map_pxm_to_node(pxm);
282
283         return node;
284 }
285 EXPORT_SYMBOL(acpi_get_node);